{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-49852", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-01T22:03:19.640Z", "datePublished": "2026-07-17T19:14:58.019Z", "dateUpdated": "2026-07-17T19:14:58.019Z"}, "containers": {"cna": {"title": "joserfc: HS256/HS384/HS512 verify accepts empty/nil HMAC key (cross-language sibling of CVE-2026-45363)", "problemTypes": [{"descriptions": [{"cweId": "CWE-287", "lang": "en", "description": "CWE-287: Improper Authentication", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-326", "lang": "en", "description": "CWE-326: Inadequate Encryption Strength", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-1391", "lang": "en", "description": "CWE-1391: Use of Weak Credentials", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/authlib/joserfc/security/advisories/GHSA-gg9x-qcx2-xmrh", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/authlib/joserfc/security/advisories/GHSA-gg9x-qcx2-xmrh"}, {"name": "https://github.com/authlib/joserfc/commit/86d00910b2b2d2d07503fee9b572906daefab7f1", "tags": ["x_refsource_MISC"], "url": "https://github.com/authlib/joserfc/commit/86d00910b2b2d2d07503fee9b572906daefab7f1"}, {"name": "https://github.com/authlib/joserfc/releases/tag/1.6.8", "tags": ["x_refsource_MISC"], "url": "https://github.com/authlib/joserfc/releases/tag/1.6.8"}], "affected": [{"vendor": "authlib", "product": "joserfc", "versions": [{"version": "< 1.6.8", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-17T19:14:58.019Z"}, "descriptions": [{"lang": "en", "value": "joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.6.8, joserfc.jwt.decode accepts attacker-forged HMAC-signed tokens when the caller-supplied verification key is the empty string or None, because HMACAlgorithm.sign and HMACAlgorithm.verify in src/joserfc/_rfc7518/jws_algs.py pass the output of OctKey.get_op_key(...) to hmac.new(...) and OctKey.import_key in src/joserfc/_rfc7518/oct_key.py only emits a SecurityWarning for keys shorter than 14 bytes without rejecting zero-length input. This issue is fixed in version 1.6.8."}], "source": {"advisory": "GHSA-gg9x-qcx2-xmrh", "discovery": "UNKNOWN"}}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.6.8)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "joserfc", "source": "cna", "vendor": "authlib"}, "product": "joserfc", "vendor": "authlib"}], "created": "2026-07-17T20:30:03.682772+00:00", "updated": "2026-07-17T20:30:03.682794+00:00", "vendors": ["authlib", "authlib$PRODUCT$joserfc"]}